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Operation Guide 3040
3
Reception Ranges
The table below shows the time calibration signal that the watch receives when a particular city code is selected as your Home City.
• For information about selecting a Home City, see “To configure Home City settings”. See the “City Code List” for more information.
Home City (Supports signal reception)
TYO, SEL, TPE, BJS, HKG
HNL, ANC, YVR, LAX, YEA, DEN, MEX, YWG, CHI, MIA, YTO,
NYC, YHZ, YYT
LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW
Receivable Transmitter
Japanese (JJY) time calibration signal
United States (WWVB) time calibration signal
English (MSF) and German (DCF77) time calibration signal
• The BJS (Beijing), HKG (Hong Kong), HNL (Honolulu), ANC (Anchorage), and MOW (Moscow) city codes also support time calibration
signal reception. Reception from the applicable locations is possible under favorable conditions.
1000km
Mt. Hagane
(60kHz)
Mt. Otakadoya
(40kHz)
500km
1000km
500km
Transmitter Location
3000km
1000km
Fort Collins
1500km
500km
Mainflingen
Rugby
Japan (JJY)
United States (WWVB)
England (MSF), Germany (DCF77)
• Certain conditions can make reception impossible even when the watch is within one of the reception ranges shown above. Signals become
weaker outside of the smaller circles indicated by dashed lines, so the reception environment has a greater effect on signal reception.
The following can also affect signal reception: geographic contours, structures, weather, climate, time of day (afternoon, evening), noise.
What is a radio-controlled watch?
Your radio-controlled watch is designed to receive a time
calibration signal that contains standard time data and adjust its
current time setting accordingly.
Cesium
atomic clock
Transmitter
Watch
Long-wave time
calibration signal
After the watch receives the time calibration signal, it performs
internal calculations to determine the current time. Because of
this, there may be an error of up to one second in the
displayed time.
Calibration Signal
• The Japanese calibration signal (Call Sign: JJY) is maintained by
the National Institute of Information and Communications
Technology (NICT). It is transmitted 24 hours a day from the Mt.
Otakadoya transmitter (40 kHz) located in Tamura-gun,
Fukushima Prefecture, and from the Mt. Hagane transmitter (60
kHz) located on the border between Saga Prefecture and
Fukuoka Prefecture.
• The U.S. calibration signal (Call Sign: WWVB) is transmitted by
the National Institute of Standards and Technology (NIST) from
Fort Collins, Colorado.
• The U.K. calibration signal (Call Sign: MSF) is transmitted by the
National Physical Laboratory (NPL) from Rugby, Warwickshire.
• The German calibration signal (Call Sign: DCF77) is transmitted
by Physikalisch - Technische Bundesanstalt (PTB) from
Mainflingen.
The time data of the Japanese calibration signal (Call Sign:
JJY) is maintained by the Japan Standard Time Group of the
National Institute of Information and Communications
Technology (NICT). Note that transmission of the standard
wave may be interrupted occasionally due to maintenance,
lightning, etc. For more information, visit the website of the
Japan Standard Time Group of the National Institute of
Information and Communications Technology (NICT) at the
following URL.
http://jjy.nict.go.jp
• Note that the above URL is subject to change.
How a Radio-controlled Watch Works
Receiving the Calibration Signal
There are two methods you can use in order to receive the time calibration signal.
• Auto Receive, six times a day: Midnight, 1:00, 2:00, 3:00, 4:00, and 5:00 a.m.
• Manual receive (You initiate reception using a button operation.)
• Any time a signal receive operation is successful, no more auto receive operations are performed that day.
• The watch is set up for auto receive at the factory, so all you need to do is to place it in a location that allows good reception each night.
Note however that auto receive is turned off for the following city codes: BJS, HKG, HNL, ANC, and MOW.
For information about turning auto receive on and off, see “To turn auto receive on and off”.
• Auto receive will be performed whenever the Timekeeping Mode (see “Modes and Indicators”) Home Time reaches one of the times shown
above.
• The auto receive start time differs according to the current home city and summer time setting.
Home City
Auto Receive Start Times
12 3 456
TYO, SEL, TPE, BJS,
HKG
HNL, ANC, YVR, LAX, YEA,
DEN, MEX, YWG, CHI, MIA,
YTO, NYC, YHZ, YYT
LIS, LON
ATH
MOW
MAD, PAR, ROM, BER,
STO
Standard Time
00:00 a.m. 01:00 a.m. 02:00 a.m.
00:00 a.m.
01:00 a.m.
02:00 a.m.
Standard Time
01:00 a.m. 02:00 a.m. 03:00 a.m.
Summer Time
02:00 a.m. 03:00 a.m. 04:00 a.m.
Standard Time
Summer Time
Standard Time
02:00 a.m. 03:00 a.m. 04:00 a.m.
03:00 a.m.
03:00 a.m.
04:00 a.m.
04:00 a.m.
04:00 a.m.
05:00 a.m.
05:00 a.m.
05:00 a.m.
05:00 a.m.
05:00 a.m.
Summer Time
03:00 a.m. 04:00 a.m. 05:00 a.m.
Standard Time
03:00 a.m. 04:00 a.m. 05:00 a.m.
Summer Time
04:00 a.m. 05:00 a.m.
Standard Time
04:00 a.m. 05:00 a.m.
Summer Time
05:00 a.m. 04:00 a.m.
00:00 the following
morning
00:00 the following
morning
00:00 the following
morning
01:00 the following
morning
00:00 the following
morning
00:00 the following
morning
01:00 the following
morning
01:00 the following
morning
02:00 the following
morning
00:00 the following
morning
00:00 the following
morning
01:00 the following
morning
01:00 the following
morning
02:00 the following
morning
02:00 the following
morning
03:00 the following
morning
00:00 the following
morning
01:00 the following
morning
01:00 the following
morning
02:00 the following
morning
02:00 the following
morning
03:00 the following
morning
03:00 the following
morning
Location
Reception is difficult and may even be impossible in the locations described below. Avoid such locations when performing signal reception.
• You should think of your watch operating like a radio or TV when it is receiving the calibration signal.
If you are experiencing problems with reception, move away from the types of locations described above to a location with better
reception, and try again.
Next to a household appliance or
office equipment (TV, speaker,
fax, computer, cell phone, etc.)
Among or near buildings Near high-voltage lines Inside a vehicle
(automobile, train, plane, etc.)
Near mountainsIn a location where there is
radio interference (construction
site, airport, etc.)